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Why designers do what they do, how they arrive at their decisions, and what knowledge they use to make these decisions can be difficult concepts for students and others new to the subject to fully understand. In addition, design theory is a subject open to wide interpretation but the understanding and study of which is essential to becoming a successful designer. What Designers Know presents a sophisticated set of ideas about the nature of design knowledge. It explores whether design knowledge is special, and attempts to get to the root of where design knowledge comes from. Crucially, it focuses on how designers use drawings in communicating their ideas and how they 'converse' with them as their designs develop. It also shows how experienced designers use knowledge differently to novices suggesting that design 'expertise' can be developed.